Short answers, pulled from the story.
Leopold Anton von Firmian (the 11th of March 1679 - the 22nd of October 1744) was an Austrian nobleman and Catholic churchman who served as Bishop of Lavant, Bishop of Seckau, and Prince-Archbishop of Salzburg from 1727 until his death. He came from the House of Firmian, one of the oldest Tyrolean noble families, whose ancestral seat was Sigmundskron castle in the County of Tyrol.
On the 31st of October 1731, Firmian signed an Edict of Expulsion ordering all Protestants in the Archbishopric of Salzburg to either recant their beliefs or be banished within days. More than twenty thousand people chose exile, and Firmian deployed over 6,000 Austrian soldiers to enforce the order. Firmian deliberately chose the date to coincide with the 214th anniversary of Martin Luther's Ninety-five Theses.
Most of the exiles who survived their journey were received by King Frederick William I of Prussia and settled around Gumbinnen in East Prussia. Others found refuge in Hanover, the Netherlands, and the British colony of Georgia.
Firmian had Schloss Klessheim completed and commissioned Schloss Leopoldskron as his private residence. He also redesigned the Kapitelschwemme and Marstallschwemme. Schloss Leopoldskron was built for his nephew Franz Laktanz Firmian.
Leopold Anton von Firmian was an early patron of Leopold Mozart, father of Wolfgang Amadeus Mozart. His nephew Karl Joseph von Firmian also appears to have been among the patrons of Wolfgang Amadeus Mozart's opera Mitridate, Re di Ponto, performed in Milan around 1770.
Firmian's body is buried in the crypt of Salzburg Cathedral. His heart was placed separately beneath the floor of the Schloss Leopoldskron chapel, the private residence he described as dearly beloved.